Hi Bill,
Did you have a closer look at the "days" filter operator? see:
http://tiddlywiki.com/#days%20Operator%20(Examples):%5B%5BFilter%20Operators%5D%5D%20%5B%5Bdays%20Operator%5D%5D%20%5B%5Bdays%20Operator%20(Examples)%5D%5D